The only purifying fan to clean a whole room properly*. We design our purifying fans to go beyond test chamber conditions and focus on real home conditions ~ this is more than just having an efficient filter.*Dyson engineers and research concluded that to clean an entire room properly, you need to sense pollution events automatically; capture ultrafine pollutants; and project cleaner air around the room using Air Multiplier technology. Only the Dyson purifying fan is designed and tested to do all of this.**Dyson technology helps create a cleaner, healthier home - Our vacuums and purifiers are scientifically proven to capture particles as small as allergens and bacteria.